off-color

[ awf-kuhl-er, of- ]
/ ˈɔfˈkʌl ər, ˈɒf- /

adjective

not having the usual or standard color: an off-color gem.
of doubtful propriety or taste; risqué: an off-color joke.
not in one's usual health: to feel off-color.
Also especially British, off-col·our. Also off-col·ored (for defs 1, 2).

Origin of off-color

First recorded in 1855–60